/*
Theme Name: o2Poczta Toolkit
Theme URI: https://o2poczta.com/
Author: o2Poczta Engineering Team
Author URI: https://o2poczta.com/
Description: A modern, high-performance, lightweight WordPress theme built for o2Poczta. Features comprehensive email client setup guides, troubleshooting tools, native blog integration, and verified official navigation. Fully PHP 8.3 and WCAG 2.2 AA compliant.
Version: 1.1.0
Requires at least: 6.2
Tested up to: 6.8
Requires PHP: 8.1
License: GNU General Public License v2 or later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
Text Domain: o2poczta-toolkit
Tags: two-columns, custom-menu, featured-images, full-width-template, theme-options, translation-ready, accessibility-ready, blog
*/

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,400;0,500;0,600;0,700;0,800;1,400;1,600&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

/* ==========================================================================
   Design Tokens & CSS Variables
   ========================================================================== */
:root {
    --color-primary: #0066cc;
    --color-primary-hover: #004c99;
    --color-primary-light: #eff6ff;
    --color-primary-border: #bfdbfe;
    --color-accent: #0284c7;
    --color-accent-hover: #0369a1;

    --color-text-main: #0f172a;
    --color-text-body: #334155;
    --color-text-muted: #475569;
    --color-text-subtle: #64748b;
    --color-text-inverse: #ffffff;

    --color-bg-body: #f8fafc;
    --color-bg-surface: #ffffff;
    --color-bg-subtle: #f1f5f9;
    --color-bg-alt: #f8fafc;

    --color-border: #e2e8f0;
    --color-border-dark: #cbd5e1;

    --color-success: #166534;
    --color-success-bg: #f0fdf4;
    --color-success-border: #bbf7d0;

    --color-warning: #92400e;
    --color-warning-bg: #fffbeb;
    --color-warning-border: #fde68a;

    --color-danger: #991b1b;
    --color-danger-bg: #fef2f2;
    --color-danger-border: #fecaca;

    --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
    --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.04);

    --container-max: 1200px;
    --container-narrow: 880px;
    --header-height: 74px;

    --transition-fast: 0.15s ease-in-out;
    --transition-base: 0.25s ease-in-out;
}

/* ==========================================================================
   CSS Reset & Base
   ========================================================================== */
*, *::before, *::after {
    box-sizing: border-box;
}

html {
    font-family: var(--font-sans);
    line-height: 1.75;
    color: var(--color-text-body);
    background-color: var(--color-bg-body);
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-size: 1.05rem;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img, svg, video {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--color-primary);
    text-decoration: underline;
    text-underline-offset: 3px;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-hover);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 3px;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--color-text-main);
    line-height: 1.25;
    margin-top: 0;
    margin-bottom: 0.85rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

h1 { font-size: clamp(2rem, 4vw, 2.75rem); letter-spacing: -0.03em; font-weight: 800; }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); letter-spacing: -0.025em; font-weight: 800; }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); letter-spacing: -0.02em; font-weight: 700; }
h4 { font-size: 1.15rem; font-weight: 700; }
h5 { font-size: 1rem; font-weight: 600; }
h6 { font-size: 0.9rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; }

p {
    margin-top: 0;
    margin-bottom: 1.5rem;
    line-height: 1.8;
    color: var(--color-text-body);
    text-wrap: pretty;
}
}

code, pre {
    font-family: var(--font-mono);
}

/* Accessibility: Skip Link */
.skip-link {
    position: absolute;
    top: -100px;
    left: 1rem;
    background: var(--color-primary);
    color: #ffffff;
    padding: 0.75rem 1.25rem;
    font-weight: 700;
    z-index: 999999;
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: top 0.2s ease-in-out;
}

.skip-link:focus {
    top: 1rem;
}

/* Screen Reader Only Utility */
.screen-reader-text {
    border: 0;
    clip: rect(1px, 1px, 1px, 1px);
    clip-path: inset(50%);
    height: 1px;
    margin: -1px;
    overflow: hidden;
    padding: 0;
    position: absolute !important;
    width: 1px;
    word-wrap: normal !important;
}

/* Container */
.site-container {
    width: 100%;
    max-width: var(--container-max);
    margin-left: auto;
    margin-right: auto;
    padding-left: clamp(1rem, 3vw, 2rem);
    padding-right: clamp(1rem, 3vw, 2rem);
}

.site-container-narrow {
    max-width: var(--container-narrow);
}

/* Site Layout Structure */
.site-main {
    flex: 1 0 auto;
    padding: 2.5rem 0 4rem 0;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
    background: var(--color-bg-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    gap: 1.5rem;
}

.site-branding {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
}

.site-logo-link {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    text-decoration: none;
    color: var(--color-text-main);
}

.brand-badge {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    background: var(--color-primary);
    color: #ffffff;
    border-radius: var(--radius-md);
    font-weight: 800;
    font-size: 1.2rem;
    letter-spacing: -0.03em;
}

.brand-text {
    font-size: 1.35rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--color-text-main);
}

.brand-text span {
    color: var(--color-primary);
}

.header-nav {
    display: flex;
    align-items: center;
}

.primary-menu {
    display: flex;
    align-items: center;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 0.5rem;
}

.primary-menu > li {
    position: relative;
    margin: 0;
    padding: 0;
}

.primary-menu a {
    text-decoration: none;
    color: var(--color-text-main);
    font-weight: 600;
    font-size: 0.9rem;
    white-space: nowrap;
    padding: 0.45rem 0.75rem;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}

.primary-menu a:hover,
.primary-menu a:focus-visible,
.primary-menu .current-menu-item > a,
.primary-menu .current-menu-item > .nav-item-wrap > a {
    color: var(--color-primary);
    background: var(--color-primary-light);
}

.nav-item-wrap {
    display: inline-flex;
    align-items: center;
}

.dropdown-chevron {
    transition: transform var(--transition-fast);
    color: var(--color-text-muted);
}

.primary-menu li:hover > .nav-item-wrap .dropdown-chevron,
.primary-menu li:focus-within > .nav-item-wrap .dropdown-chevron {
    transform: rotate(180deg);
    color: var(--color-primary);
}

.sub-menu-toggle {
    display: none;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    color: var(--color-text-muted);
    border-radius: var(--radius-sm);
    align-items: center;
    justify-content: center;
}

/* Desktop Dropdown Submenu */
.primary-menu .sub-menu {
    position: absolute;
    top: calc(100% + 0.5rem);
    left: 0;
    min-width: 310px;
    background: #ffffff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: 0 16px 36px -6px rgba(15, 23, 42, 0.14), 0 8px 16px -4px rgba(15, 23, 42, 0.08);
    padding: 0.65rem;
    list-style: none;
    margin: 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 1050;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.primary-menu .menu-item-has-children:hover > .sub-menu,
.primary-menu .menu-item-has-children:focus-within > .sub-menu,
.primary-menu .menu-item-has-children.is-expanded > .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.primary-menu .sub-menu li {
    margin: 0;
    padding: 0;
    width: 100%;
}

.primary-menu .sub-menu li a {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    padding: 0.65rem 0.85rem;
    border-radius: var(--radius-md);
    font-size: 0.88rem;
    color: var(--color-text-main);
    white-space: normal;
    text-decoration: none;
    transition: all var(--transition-fast);
}

.primary-menu .sub-menu li a strong {
    font-weight: 700;
    color: var(--color-text-main);
    display: block;
    line-height: 1.3;
}

.primary-menu .sub-menu li a .sub-menu-desc {
    font-size: 0.76rem;
    font-weight: 400;
    color: var(--color-text-muted);
    line-height: 1.35;
    margin-top: 0.15rem;
}

.primary-menu .sub-menu li a:hover,
.primary-menu .sub-menu li a:focus-visible {
    background: var(--color-primary-light);
    color: var(--color-primary);
}

.primary-menu .sub-menu li a:hover strong,
.primary-menu .sub-menu li a:focus-visible strong {
    color: var(--color-primary);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-shrink: 0;
}

.btn-header-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--color-primary);
    color: #ffffff !important;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 700;
    text-decoration: none;
    white-space: nowrap;
    flex-shrink: 0;
    transition: all var(--transition-fast);
    box-shadow: 0 1px 2px rgba(0, 102, 204, 0.2);
}

.btn-header-cta:hover,
.btn-header-cta:focus-visible {
    background: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 10px rgba(0, 102, 204, 0.3);
}

/* Mobile Nav Toggle */
.mobile-nav-toggle {
    display: none;
    background: var(--color-bg-subtle);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 0.55rem;
    cursor: pointer;
    color: var(--color-text-main);
    transition: all var(--transition-fast);
}

.mobile-nav-toggle:hover,
.mobile-nav-toggle:focus-visible {
    background: var(--color-primary-light);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

@keyframes navSlideDown {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Mobile & Tablet Responsive Header (<= 1024px) */
@media (max-width: 1024px) {
    .primary-menu {
        display: none;
    }

    .mobile-nav-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .primary-menu.is-open {
        display: flex;
        flex-direction: column;
        align-items: stretch;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: #ffffff;
        padding: 1rem 1.25rem 1.5rem 1.25rem;
        border-bottom: 2px solid var(--color-primary);
        box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.15), 0 10px 10px -5px rgba(0, 0, 0, 0.08);
        gap: 0.35rem;
        z-index: 99999;
        max-height: calc(100vh - var(--header-height));
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        animation: navSlideDown 0.25s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    }

    .primary-menu.is-open li {
        width: 100%;
    }

    .primary-menu.is-open .nav-item-wrap {
        display: flex;
        align-items: center;
        justify-content: space-between;
        width: 100%;
    }

    .primary-menu.is-open .nav-item-wrap a {
        flex: 1;
        font-size: 1rem;
        font-weight: 700;
        padding: 0.75rem 0.85rem;
    }

    .primary-menu.is-open > li > a {
        font-size: 1rem;
        font-weight: 700;
        width: 100%;
        display: block;
        padding: 0.75rem 0.85rem;
        border-radius: var(--radius-md);
    }

    .primary-menu.is-open .sub-menu-toggle {
        display: flex;
        width: 44px;
        height: 44px;
        background: var(--color-bg-subtle);
        border: 1px solid var(--color-border);
        border-radius: var(--radius-sm);
        margin-left: 0.5rem;
    }

    .primary-menu.is-open .sub-menu-toggle svg {
        transition: transform var(--transition-fast);
    }

    .primary-menu.is-open .menu-item-has-children.is-expanded > .nav-item-wrap .sub-menu-toggle svg {
        transform: rotate(180deg);
    }

    /* Accordion Dropdown Submenu in Mobile Drawer */
    .primary-menu.is-open .sub-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        border: none;
        border-left: 3px solid var(--color-primary-light);
        margin: 0.25rem 0 0.5rem 1rem;
        padding: 0.35rem 0 0.35rem 0.75rem;
        background: var(--color-bg-subtle);
        border-radius: 0 var(--radius-md) var(--radius-md) 0;
        display: none;
        gap: 0.25rem;
    }

    .primary-menu.is-open .menu-item-has-children.is-expanded > .sub-menu {
        display: flex;
    }

    .primary-menu.is-open .sub-menu li a {
        padding: 0.6rem 0.75rem;
        font-size: 0.88rem;
    }
}

@media (max-width: 520px) {
    .header-inner {
        gap: 0.5rem;
    }
    .brand-text {
        font-size: 1.15rem;
    }
    .brand-badge {
        width: 32px;
        height: 32px;
        font-size: 1rem;
    }
    .btn-header-cta {
        padding: 0.45rem 0.75rem;
        font-size: 0.78rem;
    }
    .btn-header-cta .btn-icon {
        display: none;
    }
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
    padding: clamp(2.5rem, 5vw, 4.5rem) 0 2.5rem 0;
    background: linear-gradient(180deg, #ffffff 0%, var(--color-bg-body) 100%);
    border-bottom: 1px solid var(--color-border);
}

.hero-inner {
    display: grid;
    grid-template-columns: 1.25fr 0.95fr;
    gap: clamp(2rem, 4vw, 3.5rem);
    align-items: center;
}

@media (max-width: 860px) {
    .hero-inner {
        grid-template-columns: 1fr;
    }
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.3rem 0.85rem;
    background: var(--color-primary-light);
    color: var(--color-primary);
    border: 1px solid var(--color-primary-border);
    border-radius: var(--radius-full);
    font-size: 0.825rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.hero-title {
    font-size: clamp(2.25rem, 4.5vw, 3.25rem);
    line-height: 1.15;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--color-text-main);
    margin-bottom: 1rem;
}

.hero-lead {
    font-size: clamp(1.05rem, 2vw, 1.2rem);
    color: var(--color-text-muted);
    line-height: 1.6;
    margin-bottom: 1.75rem;
}

.hero-ctas {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

@media (max-width: 640px) {
    .hero-ctas {
        flex-direction: column;
        align-items: stretch;
        gap: 0.75rem;
    }
    .hero-ctas .btn {
        width: 100%;
        text-align: center;
        justify-content: center;
    }
    .hero-sublinks {
        display: flex;
        align-items: center;
        justify-content: center;
        flex-wrap: wrap;
        gap: 0.5rem;
    }
}

.hero-help-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-decoration: underline;
}

.hero-disclaimer-pill {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    color: var(--color-text-subtle);
    background: var(--color-bg-subtle);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 0.5rem 0.85rem;
    margin-top: 1.25rem;
}

/* Hero Visual Box */
.hero-visual-card {
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 1.75rem;
}

.hero-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.25rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--color-border);
}

.hero-card-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-success);
}

.status-dot {
    width: 8px;
    height: 8px;
    background: #22c55e;
    border-radius: 50%;
}

.hero-features-list {
    list-style: none;
    margin: 0 0 1.5rem 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

.hero-features-list li {
    display: flex;
    align-items: flex-start;
    gap: 0.65rem;
    font-size: 0.925rem;
    color: var(--color-text-main);
}

.hero-feature-icon {
    color: var(--color-primary);
    flex-shrink: 0;
    margin-top: 2px;
}

/* ==========================================================================
   Buttons Component
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    font-weight: 700;
    text-decoration: none;
    cursor: pointer;
    line-height: 1.2;
    transition: all var(--transition-fast);
    border: none;
}

.btn-primary {
    background: var(--color-primary);
    color: #ffffff !important;
}

.btn-primary:hover,
.btn-primary:focus-visible {
    background: var(--color-primary-hover);
}

.btn-secondary {
    background: var(--color-bg-surface);
    color: var(--color-text-main) !important;
    border: 1px solid var(--color-border-dark);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
    background: var(--color-bg-subtle);
    border-color: var(--color-primary);
    color: var(--color-primary) !important;
}

.btn-lg {
    padding: 0.9rem 1.85rem;
    font-size: 1.05rem;
}

/* ==========================================================================
   Homepage Sections
   ========================================================================== */
.home-section {
    padding: clamp(2.5rem, 5vw, 4rem) 0;
}

.section-header {
    text-align: center;
    max-width: 680px;
    margin: 0 auto 2.5rem auto;
}

.section-tag {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-primary);
    margin-bottom: 0.4rem;
}

.section-title {
    font-size: clamp(1.75rem, 3vw, 2.25rem);
    margin-bottom: 0.75rem;
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--color-text-muted);
    margin: 0;
}

/* ==========================================================================
   Blog Posts Grid
   ========================================================================== */
.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.75rem;
    margin-bottom: 2.5rem;
}

.post-card {
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.post-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.post-card-thumb {
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    background: var(--color-bg-subtle);
}

.post-card-body {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.post-card-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.825rem;
    color: var(--color-text-subtle);
    margin-bottom: 0.75rem;
}

.post-card-title {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    line-height: 1.35;
}

.post-card-title a {
    color: var(--color-text-main);
    text-decoration: none;
}

.post-card-title a:hover {
    color: var(--color-primary);
}

.post-card-excerpt {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.5;
    margin-bottom: 1.25rem;
    flex: 1;
}

.post-card-link {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--color-primary);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}

.post-card-link:hover {
    text-decoration: underline;
}

/* ==========================================================================
   FAQ Accordion
   ========================================================================== */
.faq-accordion {
    max-width: var(--container-narrow);
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.faq-item {
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.faq-trigger {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 1.5rem;
    background: transparent;
    border: none;
    text-align: left;
    font-family: inherit;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--color-text-main);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.faq-trigger:hover {
    background: var(--color-bg-subtle);
}

.faq-icon {
    font-size: 1.25rem;
    font-weight: 400;
    color: var(--color-text-subtle);
    transition: transform var(--transition-fast);
}

.faq-item.is-open .faq-icon {
    transform: rotate(45deg);
}

.faq-content {
    display: none;
    padding: 0 1.5rem 1.25rem 1.5rem;
    color: var(--color-text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
}

.faq-item.is-open .faq-content {
    display: block;
}

/* ==========================================================================
   Breadcrumbs & Article Layout
   ========================================================================== */
.breadcrumbs {
    font-size: 0.85rem;
    color: var(--color-text-subtle);
    margin-bottom: 1.5rem;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
}

.breadcrumbs a {
    color: var(--color-text-muted);
    text-decoration: none;
}

.breadcrumbs a:hover {
    text-decoration: underline;
}

.breadcrumbs-separator {
    color: var(--color-border-dark);
}

.article-content {
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: clamp(1.75rem, 5vw, 3.5rem);
    margin-bottom: 3rem;
    box-shadow: var(--shadow-sm);
    line-height: 1.8;
}

.article-header {
    margin-bottom: 2.5rem;
    padding-bottom: 1.75rem;
    border-bottom: 1px solid var(--color-border);
}

.article-title {
    font-size: clamp(2.1rem, 4vw, 2.85rem);
    font-weight: 800;
    line-height: 1.25;
    letter-spacing: -0.03em;
    color: var(--color-text-main);
    margin-top: 0.5rem;
    margin-bottom: 1rem;
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1.25rem;
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-top: 1rem;
    padding-top: 0.75rem;
    border-top: 1px dashed var(--color-border);
}

.article-body {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--color-text-body);
}

.article-body p {
    margin-top: 0;
    margin-bottom: 1.6rem;
    text-wrap: pretty;
}

.article-body h2 {
    font-size: clamp(1.6rem, 3vw, 2.1rem);
    font-weight: 800;
    letter-spacing: -0.025em;
    color: var(--color-text-main);
    margin-top: 3rem;
    margin-bottom: 1.25rem;
    padding-bottom: 0.65rem;
    border-bottom: 2px solid var(--color-border);
    position: relative;
}

.article-body h2::before {
    content: "";
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 60px;
    height: 2px;
    background: var(--color-primary);
}

.article-body h3 {
    font-size: clamp(1.3rem, 2.5vw, 1.55rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--color-text-main);
    margin-top: 2.25rem;
    margin-bottom: 0.85rem;
}

.article-body h4 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--color-text-main);
    margin-top: 1.75rem;
    margin-bottom: 0.65rem;
}

/* Lists formatting & indentation */
.article-body ul,
.article-body ol {
    margin-top: 0;
    margin-bottom: 1.75rem;
    padding-left: 2rem;
}

.article-body li {
    margin-bottom: 0.75rem;
    line-height: 1.75;
    color: var(--color-text-body);
}

.article-body li > ul,
.article-body li > ol {
    margin-top: 0.5rem;
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
}

.article-body li strong {
    color: var(--color-text-main);
}

/* Blockquotes & Callouts */
.article-body blockquote {
    margin: 2rem 0;
    padding: 1.25rem 1.75rem;
    background: var(--color-primary-light);
    border-left: 4px solid var(--color-primary);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    font-style: normal;
    color: var(--color-text-main);
}

.article-body blockquote p:last-child {
    margin-bottom: 0;
}

/* Tables in Articles */
.article-body .table-responsive,
.article-body .o2p-table-responsive {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin: 2rem 0;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    background: #ffffff;
}

.article-body table,
.o2p-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
    text-align: left;
    margin: 0;
}

.article-body th,
.o2p-table th {
    background: #0f172a;
    color: #ffffff;
    font-weight: 700;
    padding: 1rem 1.25rem;
    text-transform: uppercase;
    font-size: 0.78rem;
    letter-spacing: 0.05em;
    border: none;
    white-space: nowrap;
}

.article-body td,
.o2p-table td {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text-body);
    vertical-align: top;
    line-height: 1.6;
}

.article-body tbody tr:nth-child(even) td,
.o2p-table tbody tr:nth-child(even) td {
    background-color: #f8fafc;
}

.article-body tbody tr:hover td,
.o2p-table tbody tr:hover td {
    background-color: #eff6ff;
}

.article-body tbody tr:last-child td,
.o2p-table tbody tr:last-child td {
    border-bottom: none;
}

/* Inline and Block Code */
.article-body code,
code.o2p-code-val {
    font-family: var(--font-mono);
    font-size: 0.88em;
    background: #e2e8f0;
    color: #0f172a;
    padding: 0.2rem 0.5rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
}

.article-body pre {
    background: #0f172a;
    color: #f8fafc;
    padding: 1.5rem;
    border-radius: var(--radius-md);
    font-family: var(--font-mono);
    font-size: 0.92rem;
    line-height: 1.7;
    overflow-x: auto;
    margin: 2rem 0;
    border: 1px solid #334155;
    box-shadow: var(--shadow-sm);
}

.article-body pre code {
    background: transparent;
    color: inherit;
    padding: 0;
    font-size: inherit;
    font-weight: 400;
}

/* Numbered Step Badges & Timeline */
.o2p-steps-list {
    list-style: none;
    padding: 0;
    margin: 2rem 0;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.o2p-step-item {
    display: flex;
    gap: 1.25rem;
    align-items: flex-start;
    background: var(--color-bg-subtle);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.o2p-step-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    background: #ffffff;
}

.o2p-step-badge {
    flex-shrink: 0;
    width: 38px;
    height: 38px;
    background: var(--color-primary);
    color: #ffffff;
    font-weight: 800;
    font-size: 1.1rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgba(0, 102, 204, 0.3);
}

.o2p-step-body h4 {
    margin-top: 0;
    margin-bottom: 0.4rem;
    font-size: 1.15rem;
    color: var(--color-text-main);
}

.o2p-step-body p {
    margin-bottom: 0;
    font-size: 0.98rem;
    color: var(--color-text-muted);
}

/* ==========================================================================
   Comments
   ========================================================================== */
.comments-area {
    margin-top: 3rem;
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: clamp(1.5rem, 4vw, 2.5rem);
}

.comment-list {
    list-style: none;
    padding: 0;
    margin: 1.5rem 0;
}

.comment-body {
    padding: 1.25rem 0;
    border-bottom: 1px solid var(--color-border);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
    background: #0f172a;
    color: #94a3b8;
    padding: 3.5rem 0 2rem 0;
    margin-top: auto;
    font-size: 0.9rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr repeat(3, 1fr);
    gap: 2.5rem;
    margin-bottom: 2.5rem;
}

@media (max-width: 860px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 540px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

.footer-branding .brand-text {
    color: #ffffff;
}

.footer-desc {
    margin: 1rem 0;
    line-height: 1.5;
    color: #94a3b8;
}

.footer-col h4 {
    color: #ffffff;
    font-size: 1rem;
    margin-bottom: 1rem;
}

.footer-links {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.footer-links a {
    color: #94a3b8;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: #ffffff;
    text-decoration: underline;
}

.footer-disclaimer-box {
    background: #1e293b;
    border: 1px solid #334155;
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem;
    margin-bottom: 2rem;
    font-size: 0.825rem;
    line-height: 1.5;
    color: #cbd5e1;
}

.footer-disclaimer-box strong {
    color: #ffffff;
}

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 1.5rem;
    border-top: 1px solid #334155;
    font-size: 0.85rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-bottom a {
    color: #94a3b8;
}

.footer-bottom a:hover {
    color: #ffffff;
}

/* ==========================================================================
   Notices & Callout Badges
   ========================================================================== */
.o2p-notice {
    display: flex;
    gap: 1rem;
    padding: 1.15rem 1.35rem;
    border-radius: var(--radius-md);
    margin: 1.25rem 0 1.75rem 0;
    line-height: 1.6;
    font-size: 0.95rem;
}

.o2p-notice-warning {
    background: #fffbeb;
    border: 1px solid #fde68a;
    color: #92400e;
}

.o2p-notice-info {
    background: #eff6ff;
    border: 1px solid #bfdbfe;
    color: #1e40af;
}

.o2p-notice-success {
    background: #f0fdf4;
    border: 1px solid #bbf7d0;
    color: #166534;
}

.o2p-notice-title {
    font-size: 1rem;
    font-weight: 700;
    margin: 0 0 0.35rem 0;
}

.o2p-notice-warning .o2p-notice-title {
    color: #78350f;
}

.o2p-notice-info .o2p-notice-title {
    color: #1e3a8a;
}

.o2p-notice-success .o2p-notice-title {
    color: #14532d;
}

.o2p-badge-check {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    background: #ecfdf5;
    color: #047857;
    border: 1px solid #a7f3d0;
    padding: 0.2rem 0.55rem;
    border-radius: var(--radius-sm);
    font-size: 0.82rem;
    font-weight: 700;
}

.o2p-btn-copy {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    background: var(--color-bg-subtle);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 0.35rem 0.65rem;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-main);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.o2p-btn-copy:hover {
    background: var(--color-primary-light);
    border-color: var(--color-primary);
    color: var(--color-primary);
}